Key slide mechanism for a pushbutton radio receiver

ABSTRACT

A key slide mechanism for a pushbutton radio receiver, includes a locking lever assembly having first and second legs extending parallel to each other and joined together at a first end with first surfaces thereof being in opposing relation. The opposite end of the second one of the legs is bent into a U-shape and extends transverse the legs and partially encircles the first leg. The extreme free end of the second leg extends parallel to the first leg adjacent the surface thereof opposite the firstmentioned surface. A memory cam is mounted for rotation between the first surfaces of the legs. A pushbutton actuator rod has one end extending between the free end of the second leg and the opposite surface of the first leg. The opposite end of the pushbutton rod is separated from the legs of the locking lever assembly and is mounted in the radio tuner housing separately and independently therefrom to minimize interaction therebetween upon depression of the pushbutton actuator rod. Movement of the actuator rod to force the one end thereof into engagement with the extreme free end of the second leg, forces the first and second legs together to capture the memory cam in a preselected position corresponding to a predetermined frequency setting of the radio receiver and to join the actuator rod and locking lever assembly at the corresponding ends thereof so that the actuator rod and locking lever assembly move as a unit thereafter to recall the frequency setting each time the pushbutton actuator rod is depressed. Movement of the actuator rod in the opposite direction, separates the one end thereof and the extreme free end of the second leg to permit rotation of the memory cam for resetting.

United States Patent [191 Olah [ 1 Sept. 17, 1974 KEY SLIDE MECHANISM FOR A PUSHBUTTON RADIO RECEIVER Emery E. Olah, Schaumburg, Ill. [73] Assignee: Motorola, Inc., Chicago, 111. [22] Filed: July 12, 1973 [21] Appl. No.: 378,762

[75] Inventor:

9/1973 Mears, Jr. 74/1033 Primary Examiner-Allan D. Hermann Attorney, Agent, or Firm-Donald J. Lisa; Vincent J. Rauner [5 7] ABSTRACT A key slide mechanism for a pushbutton radio receiver, includes a locking lever assembly having first and second legs extending parallel to each other and joined together at a first end with first surfaces thereof being in opposing relation. The opposite end of the second one of the legs is bent into a U-shape and extends transverse the legs and partially encircles the first leg. The extreme free end of the second leg extends parallel to the first leg adjacent the surface thereof opposite the first-mentioned surface. A memory cam is mounted for rotation between the first surfaces of the legs. A pushbutton actuator rod has one end extending between the free end of the second leg and the opposite surface of the first leg. The opposite end of the pushbutton rod is separated from the legs of the locking lever assembly and is mounted in the radio tuner housing separately and independently therefrom to minimize interaction therebetween upon depression of the pushbutton actuator rod. Movement of the actuator rod to force the one end thereof into engagement with the extreme free end of the second leg, forces the first and second legs together to capture the memory cam in a preselected position corresponding to a predetermined frequency setting of the radio receiver and to join the actuator rod and locking lever assembly at the corresponding ends thereof so that the actuator rod and locking lever assembly move as a unit thereafter to recall the frequency setting each time the pushbutton actuator rod is depressed. Movement of the actuator rod in the opposite direction, separates the one end thereof and the extreme free end of the second leg to permit rotation of the memory cam for resetting.

12 Claims, 5 Drawing Figures PATENIEDSEHTIBH 3835.713 v SHEET 2 BF 2 KEY SLIDE MECHANISM FOR A PUSHBUTTON RADIO RECEIVER BACKGROUND This invention relates generally to pushbutton type radio tuners and more particularly to the pushbutton mechanisms employed therein and the mounting thereof in the tuner.

Presently used key slide mechanisms employed in pushbutton radio tuners for automobiles and the like can be adjusted to recall a particular frequency setting of the radio tuner each time the pushbutton attached thereto is depressed.

In the key slide mechanism, a bar to which the pushbutton is attached, is positioned adjacent a clamping member which holds, between opposing legs thereof, a memory cam. The memory cam is used for engagement of a frequency selecting mechanism, usually a treadle bar thereof, to move the latter to a selected frequency setting. After separating the bar and clamping member, depression of the pushbutton causes the bar to move the legs of the clamping member together to capture the memory cam in a position selected in accordance with the preselected positioning of the treadle bar. Thereafter, depression of the pushbutton causes the then coupled bar and clamping member to be moved together to in turn recall the frequency to which the memory cam has been set.

With presently used key slide mechanisms, the clamping action of the clamping member by the movable pushbutton bar occurs somewhat toward the center of the key slide. mechanism, but nearer the end thereof opposite the pushbutton. Normally, however, the clamp member and bar are secured in sliding or the like fashion with respect to each other near the pushbutton end of the key slide as well. Thus, any movement applied to the pushbutton is transmitted somewhat to the clamping member and the memory cam, which controls the position of the frequency adjusting mechanism of the radio tuner. Accordingly, the manner in which the pushbutton is depressed and the angle of depression thereof by a person selecting a station, becomes a factor in the proper tuning of the radio receiver to the desired frequency setting.

SUMMARY Accordingly, it is an object of the present invention to provide a new and improved pushbutton mechanism for a radio tuner which overcomes the drawbacks of prior art pushbutton or key slide mechanisms.

It is still another object of the present invention to provide a new and improved pushbutton mechanism and mounting arrangement therefor which permits depression of the pushbutton at substantially any angle while nevertheless achieving proper tuning of the radio receiver.

It is yet another object of the present invention to provide a new and improved key slide or pushbutton mechanism for a radio receiver which uses fewer parts than standard pushbutton key slides, is easier to assemble and is relatively inexpensive to fabricate.

Briefly, a key slide or pushbutton mechanism for a pushbutton radio receiver according to the invention includes a conventional fan-shaped memory cam which is mounted for pivotal movement on a first surface of a first leg of a locking lever assembly near a first end of the latter. A second leg of the assembly overlies the first leg along the first surface of the latter to sandwich the memory cam therebetween. Thereafter, toward the opposite end of the locking assembly, the second leg is bent into a U shape about the first leg and extends substantially parallel with the first leg along a second, opposite surface of the latter. A cam surface is provided on the free end of the second leg extending toward the second surface of the first leg.

'An elongated pushbutton actuator rod or bar extends between the second surface of the first leg and the cam on the second leg, and also includes a cam surface at the free end thereof positioned for engagement with the cam surface of the second leg of the locking assembly. Mating of the two cam surfaces urges the first and second legs of the locking assembly together against the memory cam, thereby preventing the cam from pivoting and. maintaining the latter in a fixed position.

Movement of the actuator rod in a direction toward the first end of the locking assembly separates the mating cam surfaces of the second leg of the locking assembly and actuator rod, respectively, to release the memory cam for rotation. Depression of the actuator rod thereafter, once again locks the memory cam into a new position.

The actuator rod and first end of the locking assembly are separate and therefore can be mounted independently, side by side in the chassis of a radio receiver in which the key slide is employed. The separation thereat minimizes the movement of the locking assembly and memory cam due to improper or angular depression of the actuator rod, so that accurate tuning of the radio receiver is achieved.

DESCRIPTION OF THE DRAWINGS In the drawings:

FIGS. 1 and 2 are top views of a key slide mechanism for a pushbutton radio receiver shown in positions wherein the memory tab is locked in a preselected position and is released for movement to a preselected position, respectively, according to the invention;

FIG. 3 is a fragmentary, sectional view of the key slide mechanism of FIGS. 1 and 2 shown mounted in a front mounting plate in a radio tuner housing;

FIG. 4 is an exploded, perspective view of the key slide mechanism as seen from the side thereof opposite from that shown in FIG. 3, and

FIG. 5 is a perspective view of the radio tuner portion of a pushbutton radio receiver including a plurality of key slide mechanisms according to the invention.

DETAILED DESCRIPTION Referring now to the drawings in greater detail wherein like numerals have been employed throughout the various views to indicate similar components, there is shown in FIGS. 1, 2 and 4, a key slide mechanism 10 for use in a pushbutton radio receiver or the like device according to the invention.

The key slide mechanism includes a locking lever assembly 12 having first and second parallel extending legs designated generally by the numerals l4, 16, respectively, formed, in a preferred embodiment, from a singlelength of spring metal material which is folded back on itself at one end 18. Alternatively, two separate pieces of spring metal could be used to fashion separate legs which are joined together by riveting or other suitable fastening techniques, at a location whereat the fold 18 is shown.

Leg 14 of the locking lever assembly includes a first portion 20 extending outwardly from fold 18 and is bent near the free end thereof at right angles with respect to portion 20 to form a second leg portion 22 (See FIG. 4). A third leg portion 24 extends from leg portion 22 at right angles thereto and is of a predetermined length. Thereafter, a second bend is made in leg 14, whereat a fourth leg portion 26 extends parallel to leg portion 22 so that leg portions 22, 24, 26 form a U which extends transverse legs 14, 16 and partially encircles leg 16. A fifth leg portion 28 extends from leg portion 26 in parallel alignment with the main portion 20 of leg 14 and includes, at the free end thereof, a curved cam portion 30, the function of which will be described hereinafter.

A fan-shaped memory cam 32 is mounted between legs 14, 16 of the locking lever assembly near the point of attachment, herein fold 18, of the legs. The memory cam is mounted for rotation between first surfaces, 15, 17, respectively, of legs 14, 16 by means of a pin 34 extending from leg 16 into an aperture 36 provided in the memory cam. The memory cam is similar to those conventionally used in key slide mechanisms, including a pair of outwardly extending wings or lobes 38, 40 (See FIGS. 3 and 4) which, as will be described in greater detail hereinafter, engage a treadle bar such as 37 (See FIG. or the like apparatus in the tuner portion 39 of a radio receiver to rotate the treadle bar for positioning a number of slideable tuning cores with respect to stationary tuning coils for changing the radio frequency setting of the radio receiver.

A squeezing of the legs 14, 16 together, captures the memory cam between surfaces 15, 17 thereof to prevent rotation of the cam. Upon separating the legs, the memory cam is free to rotate for repositioning to a new selected position. In the well known manner, each pushbutton mechanism can be set for moving the tuning cores to a different position with respect to the tuning coils for receiving different preselected radio frequencies.

To move the legs 14, 16 for locking and releasing the memory cam as described, and for moving the treadle bar to recall a preselected radio frequency setting, there is provided a pushbutton actuator rod 42. The actuator rod includes a pushbutton member 44 mounted on a first end 46 thereof. The rod extends outwardly from the pushbutton member 44 and includes a cam member 48 on the opposite free end thereof which, as will be described, is provided for mating cooperation with cam portion 30 of the locking lever assembly 12.

To assemble the key slide, the end of actuator rod 42 including cam member 48 is received along a surface 50 of leg 16 opposite surface 17 thereof and extends through the U formed by leg portions 22, 24, 26 of leg 14 until a portion 52 extending beyond cam member 48 substantially perpendicular to the actuator rod 42, is received in a cutout or slot 54 formed in the end of leg 16. The receipt of extension portion 52 in slot 54 joins the pushbutton plunger rod and locking lever assembly together in sliding relation at the end of the key slide mechanism opposite the pushbutton member 44. In the embodiment of the actuator rod member 42 shown in the drawings, the center portion 56 is bent away from the leg 16 of the locking lever assembly to ensure separation of the two near the pushbutton end of the key slide mechanism. Movement of actuator rod 42 to cause engagement of cam 48 thereof with cam 30 of leg 14 locks the lever assembly and actuator rod together so that they are moved as a unit upon depression of pushbutton member 44.

In mounting the key slide mechanism in the tuner portion 39 of a radio receiver, separate slotted apertures 58, 60 (See FIG. 3) dimensioned for receipt of an end 19 of leg 16 of the locking lever assembly and the actuator rod 42, respectively, are provided in a front plate member such as 62 of the radio receiver. The separate mounting of the actuator rod and locking lever assembly at the pushbutton end of the key slide mechanism prevents angular or indirect pushing against the pushbutton member 44 from mistuning the radio receiver. Mistuning due to the latter occurs often in the case of prior art key slide mechanisms wherein the actuator member and memory tab support assembly are coupled both near the free end of the key slide mechanism and near the pushbutton end thereof as well.

The rear portion or end of the key slide mechanism (opposite the pushbutton end) which is coupled by the receipt of extension portion 52 in slot 54, is received in an aperture 67 provided therefor in a rear plate member 64 of the radio tuner (See FIG. 5). The plate mem ber 64 in the particular tuner embodiment shown, also supports the radio tuning coil assemblies 66. The end 68 of the key slide is employed to actuate a declutch bar arrangement 70 in the radio tuner, the latter being similar to other declutch bar arrangements in conventional radio tuners. As is well known, the movement of the end of the key slide mechanism into camming engagement with the cam surface 73 of the declutch bar causes the latter to be moved sidewise (See arrow, FIG. 5) to disengage a manual tuner control (not shown) in the radio tuner. In the case of the instant key slide mechanism, cam member 48 on the plunger rod which is used to engage cam 30 for locking the memory tab 32 into place, is also used for engagement of the de clutch bar to move the latter in the sidewise position as described.

As shown in FIG. 5, the radio tuner 39 includes the fixed tuning coil assembly 66 mentioned heretofore, mounted on a back plate 64 thereof. Tuning cores, such as 74, are slideable into and out of the coil assemblies for changing the frequency received by the radio receiver in which the tuner is mounted. Threaded extensions such as 76 of the tuning cores are received in apertures such as 78 in a carriage bar 80 movable in the direction of arrows 82 to in turn adjust the relative positions of the tuning cores and coil assemblies 74, 66, respectively.

To move the tuning carriage bar 80 as described, there is provided the treadle bar assembly 37. The treadle bar assembly 37 includes the usual treadle bar mechanism 84 having a pair of spaced parallel bars 86, 88 which are rigidly joined together by intermediate members (not shown) extending therebetween. The treadle bar mechanism is pivotal about the ends, such as 90 provided intermediate the bars 86, 88 whereat the mechanism is attached to a side wall 92 of the radio tuner housing. An arm 94 extending from the treadle bar mechanism is received in an aperture 96 formed in a side am 98 of carriage bar 80. Pivotal movement of the treadle bar mechanism about ends such as 90,

moves the arm 94 in an arcuate motion to in turn drive the bar 80 in the direction of arrows 82.

The treadle bar mechanism is driven arcuately by the depression of pushbutton members 44. As a pushbutton member is depressed, one of the lobes 38, 40, of a corresponding memory cam of the key slide mechanism thereof, engages one of the parallel bars 86, 88 of the treadle bar assembly to pivot the treadle bar mechanism about pivot points, such as 90, to drive the tuning cores 74 with respect to coil assembly 66, as described. Release of the pushbutton member thereafter permits coil spring 100 attached at one end 102 to a hook mem ber 104 extending from the fourth leg portion 26 of the leg 12 of the locking lever assembly and at the other end 106 to a stationary member 108 on the tuner housing (See FIG. 5) to return the key slide mechanism to its original position.

Each time the same pushbutton member is depressed, the treadle bar assembly is rotated to a corresponding position to in turn position cores 74 with respect to coil assemblies 66, for recalling a predetermined frequency received by the radio receiver.

To adjust the setting associated with a particular pushbutton member, the pushbutton end of the assembly is pulled outwardly away from the tuner housing so that the cam end 48 of the actuator rod 42 is moved out of engagement with cam 30 (See FIG. 2) thereby separating actuator rod 42 and the locking lever assembly to release memory cam 32 for rotationabout pin 34.

Thereafter, the treadle bar is positioned to a desired location with the aid of a manual tuning device (not shown) or other suitable means, and is held thereat by the force provided by the manual tuning device. Once positioned to the desired frequency setting, the pushbutton is again depressed so that one of the lobes of the memory cam engages one of the bars 86, 88 of the fixed treadle bar mechanism to relocate the memory cam in a corresponding position. Further inward movement or depression of the pushbutton member moves the actuator rod 42 so that cam 48 thereof engages cam surface 30 (FIG. 1) to lock the memory cam once again between legs 14, 16, of the locking assembly and to lock the locking lever assembly and the actuator rod together for movement as a unit. Thereafter, depression of the pushbutton member will result in moving the treadle bar to the new preselected position.

As mentioned heretofore, because of the separate and independent mounting of the actuator rod and locking lever assembly 12 at the pushbutton end of the key slide mechanism, mistuning of the radio receiver due to an angular force being applied to the pushbutton for depressing the latter, is minimized. Furthermore, because of the design of the device; i.e. having only three major components, fabrication thereof is made easy and relatively inexpensive.

While a preferred embodiment of the invention has been shown and described, it should be understood that the invention is not limited thereto since many modifications may be made. It is therefore contemplated to cover by the present application any and all such modifications as fall within the true spirit and scope of the appended claims.

I claim:

1. A key slide mechanism for a radio or the like tuner, including in combination: a locking lever assembly comprising first and second legs joined together at a first end thereof and extending substantially parallel to each other therefrom with first surfaces of said legs being in opposing relation, the opposite end of said sec ond leg being formed into a U-shape and extending transverse said first leg and partially encircled thereabout, the extreme free end of said second leg extending parallel to the free end of said first leg adjacent the surface of the last-mentioned leg opposite said first surface thereof, a memory cam mounted between the opposing first surfaces of said first and second legs of said locking assembly for rotational movement in a plane parallel to said first and second legs, said memory cam being locked into place to prevent rotation thereof upon moving said first and second legs together, thereby to frictionally engage said memory cam at the first surfaces thereof and actuator means extending between the extreme free end of said first and second legs adjacent said opposite surface of said first leg, said actuator means being movable to first and second positions with respect to said locking lever assembly in a plane parallel to said legs, to force said legs together for capturing said memory cam therebetween and to separate said legs to free said memory cam for rotation, respectively.

2. A key slide mechanism as claimed in claim 1 wherein said actuator means includes an elongated member extending substantially parallel to and separated from said locking assembly along the end thereof whereat said first and second legs are joined together,

said elongated member including cam means on the opposite free end thereof for engaging said extreme free end of said second leg upon movement of said elongated member to said first position for separating said extreme free end of said second leg from the opposite surface of said first leg, thereby to move the first surfaces of said first and second legs toward each other for capturing said memory cam therebetween.

3. A key slide mechanism as claimed in claim 2 wherein said actuator member includes locking means and wherein the free end of said locking assembly includes mating locking means for joining said actuator member and said locking assembly together for sliding relation with respect to each other.

4. A key slide mechanism as claimed in claim 3 wherein said actuator locking means includes a free end portion of said elongated member extending transverse said first leg of said locking lever assembly and wherein said mating locking means of said locking lever assembly includes means defining an opening in said first leg for receiving said free end portion of said elongated member, said free end portion being movable in said opening in accordance with the movement of said elongated member to said first and second positions, respectively.

5. A key slide mechanism as claimed in claim 1 wherein the extreme free end of said second leg of said locking assembly includes a cam member and wherein said actuator means includes a cam member positioned for cooperative engagement with the cam member of said second leg upon movement of said actuator means to said first position whereby the first surfaces of said first and second legs are forced together.

6. A key slide mechanism as claimed in claim 5 wherein said actuator means and locking assembly are coupled together at said cam members upon engagement thereof to permit movement of said actuator means and locking assembly as a unit.

7. A key slide mechanism as claimed in claim 1 wherein said locking assembly is formed of a single piece of spring material folded back on itself to form said first and second parallel legs, said legs being joined at said fold.

8. A key slide mechanism as claimed in claim 1 wherein said memory cam includes an aperture formed therein and wherein one of said first and second legs includes a pin member extending from a first surface thereof and received in said aperture in said memory cam, whereby said cam is rotatable thereon.

9. In a radio receiver device including a tuner having a housing with separated front and rear parallel walls and a pair of side walls joining said front and rear walls at opposite ends thereof, a treadle bar assembly mounted for rotation between said side walls including a pair of fixedly spaced bars, said assembly being rotatable about end points located between said bars, a plurality of tuning coil assemblies mounted on said rear housing wall and a plurality of tuning cores being movable relative to said coil assemblies for adjusting the frequency received by said radio receiver device and a core carriage to which said cores are coupled for simultaneous movement therewith, said core carriage being coupled to said treadle bar, whereby rotation of the latter imparts movement to said carriage thereby to move said cores with respect to said coil assemblies, a plurality of pushbutton operated key slide mechanisms for engagingly driving said treadle bar rotatably to in turn adjust the frequency of said radio receiver to predetermined settings, each said key slide mechanism being mounted between said front and rear walls for movement in a direction substantially perpendicular thereto and including in combination: a locking lever assembly comprising first and second legs joined together at first ends thereof and extending substantially parallel to each other with first surfaces of each of said legs being in opposing relation, the opposite end of said second leg being formed into a U-shape and extending substantially transverse the direction of extension of the legs and partially encircled about said first leg, the extreme free end of said second leg extending parallel to the free end of said first leg adjacent the surface of the lastmentioned leg opposite said first surface thereof, a memory cam for engagement with said treadle bar for rotating the latter to adjust the frequency of said radio receiver, mounted between the opposing first surfaces of said first and second legs of said locking assembly, said memory cam being rotatable in a plane parallel to said first and second legs, being lockable into a predetermined position corresponding to a preselected frequency setting of said radio receiver device, to prevent rotation thereof upon moving said first and second legs together in frictional engagement therewith and pushbutton actuator rod means extending between the extreme free end of said first and second legs adjacent said opposite surface of said first leg, said actuator rod means being movable to first and second positions with respect to said locking lever assembly in a plane parallel to said legs to engage, at a first end thereof, the extreme free end of said second leg to force the first and second legs together to capture said memory cam therebetween and to separate said legs to free said cam for rotation, respectively, said locking assembly and actuator rod means being joined together upon movement of the last-mentioned means to said first position for movement as a unit, the opposite end of said actuator rod means being separated from a corresponding end of said locking lever assembly, the last-mentioned ends being mounted independently in said front wall of said tuner housing to minimize interaction therebetween upon movement of said key slide to adjust the radio frequency of said radio receiver device, said opposite end of said actuator rod extending outwardly of said housing and including pushbutton means for urging said key slide mechanism toward said front wall of said housing for engagement of said memory cam with one of said bars of said treadle bar assembly for rotating the latter to a location corresponding to the positioning of said memory cam between said first and second legs of said locking lever assembly.

10. A radio receiver device as claimed in claim 9 wherein the front wall of said tuner housing includes first and second apertures extending therethrough, said apertures being arranged side by side and spaced a predetermined distance from each other and wherein the first end of one of the legs of said locking lever assembly is mounted in a first one of said apertures for movement therein substantially perpendicular to said wall and said actuator rod is mounted in the second one of said apertures for movement therein substantially perpendicular to said wall.

11. A radio receiver device as claimed in claim 9 wherein said actuator rod includes a cam surface at a first end thereof, wherein said extreme free end of said second leg also includes a cam surface facing the cam surface of said actuator rod and wherein upon movement of said actuator rod to said first position said cam surfaces are engageable to force said first and second legs together to capture said memory cam therebetween and to removably secure said actuator rod and locking lever assembly together for movement thereafter as a unit.

12. A radio receiver device as claimed in claim 11 further including a declutch bar movable in a direction transverse the direction of movement of said key slide mechanism, said declutch bar including a plurality of cam surfaces thereon, each located for engagement with one of said plurality of key slide mechanisms and wherein upon moving one of said pushbutton key slide mechanisms toward said first walls, said cam surface of a corresponding actuator rod engages a corresponding cam surface on said declutch bar to move the latter in said direction transverse the movement of said key slide mechanism. 

1. A key slide mechanism for a radio or the like tuner, including in combination: a locking lever assembly comprising first and second legs joined together at a first end thereof and extending substantially parallel to each other therefrom with first surfaces of said legs being in opposing relation, the opposite end of said second leg being formed into a U-shape and extending transverse said first leg and partially encircled thereabout, the extreme free end of said second leg extending parallel to the free end of said first leg adjacent the surface of the last-mentioned leg opposite said first surface thereof, a memory cam mounted between the opposing first surfaces of said first and second legs of said locking assembly for rotational movement in a plane parallel to said first and second legs, said memory cam being locked into place to prevent rotation thereof upon moving said first and second legs together, thereby to frictionally engage said memory cam at the first surfaces thereof and actuator means extending between the extreme free end of said first and second legs adjacent said opposite surface of said first leg, said actuator means being movable to first and second positions with respect to said locking lever assembly in a plane parallel to said legs, to force said legs together for capturing said memory cam therebetween and to separate said legs to free said memory cam for rotation, respectively.
 2. A key slide mechaNism as claimed in claim 1 wherein said actuator means includes an elongated member extending substantially parallel to and separated from said locking assembly along the end thereof whereat said first and second legs are joined together, said elongated member including cam means on the opposite free end thereof for engaging said extreme free end of said second leg upon movement of said elongated member to said first position for separating said extreme free end of said second leg from the opposite surface of said first leg, thereby to move the first surfaces of said first and second legs toward each other for capturing said memory cam therebetween.
 3. A key slide mechanism as claimed in claim 2 wherein said actuator member includes locking means and wherein the free end of said locking assembly includes mating locking means for joining said actuator member and said locking assembly together for sliding relation with respect to each other.
 4. A key slide mechanism as claimed in claim 3 wherein said actuator locking means includes a free end portion of said elongated member extending transverse said first leg of said locking lever assembly and wherein said mating locking means of said locking lever assembly includes means defining an opening in said first leg for receiving said free end portion of said elongated member, said free end portion being movable in said opening in accordance with the movement of said elongated member to said first and second positions, respectively.
 5. A key slide mechanism as claimed in claim 1 wherein the extreme free end of said second leg of said locking assembly includes a cam member and wherein said actuator means includes a cam member positioned for cooperative engagement with the cam member of said second leg upon movement of said actuator means to said first position whereby the first surfaces of said first and second legs are forced together.
 6. A key slide mechanism as claimed in claim 5 wherein said actuator means and locking assembly are coupled together at said cam members upon engagement thereof to permit movement of said actuator means and locking assembly as a unit.
 7. A key slide mechanism as claimed in claim 1 wherein said locking assembly is formed of a single piece of spring material folded back on itself to form said first and second parallel legs, said legs being joined at said fold.
 8. A key slide mechanism as claimed in claim 1 wherein said memory cam includes an aperture formed therein and wherein one of said first and second legs includes a pin member extending from a first surface thereof and received in said aperture in said memory cam, whereby said cam is rotatable thereon.
 9. In a radio receiver device including a tuner having a housing with separated front and rear parallel walls and a pair of side walls joining said front and rear walls at opposite ends thereof, a treadle bar assembly mounted for rotation between said side walls including a pair of fixedly spaced bars, said assembly being rotatable about end points located between said bars, a plurality of tuning coil assemblies mounted on said rear housing wall and a plurality of tuning cores being movable relative to said coil assemblies for adjusting the frequency received by said radio receiver device and a core carriage to which said cores are coupled for simultaneous movement therewith, said core carriage being coupled to said treadle bar, whereby rotation of the latter imparts movement to said carriage thereby to move said cores with respect to said coil assemblies, a plurality of pushbutton operated key slide mechanisms for engagingly driving said treadle bar rotatably to in turn adjust the frequency of said radio receiver to predetermined settings, each said key slide mechanism being mounted between said front and rear walls for movement in a direction substantially perpendicular thereto and including in combination: a locking lever assembly comprising first and second legs joined together at first ends thereof and extending substantially paralLel to each other with first surfaces of each of said legs being in opposing relation, the opposite end of said second leg being formed into a U-shape and extending substantially transverse the direction of extension of the legs and partially encircled about said first leg, the extreme free end of said second leg extending parallel to the free end of said first leg adjacent the surface of the last-mentioned leg opposite said first surface thereof, a memory cam for engagement with said treadle bar for rotating the latter to adjust the frequency of said radio receiver, mounted between the opposing first surfaces of said first and second legs of said locking assembly, said memory cam being rotatable in a plane parallel to said first and second legs, being lockable into a predetermined position corresponding to a preselected frequency setting of said radio receiver device, to prevent rotation thereof upon moving said first and second legs together in frictional engagement therewith and pushbutton actuator rod means extending between the extreme free end of said first and second legs adjacent said opposite surface of said first leg, said actuator rod means being movable to first and second positions with respect to said locking lever assembly in a plane parallel to said legs to engage, at a first end thereof, the extreme free end of said second leg to force the first and second legs together to capture said memory cam therebetween and to separate said legs to free said cam for rotation, respectively, said locking assembly and actuator rod means being joined together upon movement of the last-mentioned means to said first position for movement as a unit, the opposite end of said actuator rod means being separated from a corresponding end of said locking lever assembly, the last-mentioned ends being mounted independently in said front wall of said tuner housing to minimize interaction therebetween upon movement of said key slide to adjust the radio frequency of said radio receiver device, said opposite end of said actuator rod extending outwardly of said housing and including pushbutton means for urging said key slide mechanism toward said front wall of said housing for engagement of said memory cam with one of said bars of said treadle bar assembly for rotating the latter to a location corresponding to the positioning of said memory cam between said first and second legs of said locking lever assembly.
 10. A radio receiver device as claimed in claim 9 wherein the front wall of said tuner housing includes first and second apertures extending therethrough, said apertures being arranged side by side and spaced a predetermined distance from each other and wherein the first end of one of the legs of said locking lever assembly is mounted in a first one of said apertures for movement therein substantially perpendicular to said wall and said actuator rod is mounted in the second one of said apertures for movement therein substantially perpendicular to said wall.
 11. A radio receiver device as claimed in claim 9 wherein said actuator rod includes a cam surface at a first end thereof, wherein said extreme free end of said second leg also includes a cam surface facing the cam surface of said actuator rod and wherein upon movement of said actuator rod to said first position said cam surfaces are engageable to force said first and second legs together to capture said memory cam therebetween and to removably secure said actuator rod and locking lever assembly together for movement thereafter as a unit.
 12. A radio receiver device as claimed in claim 11 further including a declutch bar movable in a direction transverse the direction of movement of said key slide mechanism, said declutch bar including a plurality of cam surfaces thereon, each located for engagement with one of said plurality of key slide mechanisms and wherein upon moving one of said pushbutton key slide mechanisms toward said first walls, said cam surface of a corresponding actuator rod engages a corresponding cam surface oN said declutch bar to move the latter in said direction transverse the movement of said key slide mechanism. 